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The heat of hydration of a cement is governed chiefly by its content of

  • A.tricalcium silicate and tricalcium aluminate
  • B.dicalcium silicate together with the ferrite phase
  • C.the gypsum and the free lime taken together
  • D.the magnesia and the alkali oxides present

Answer: A

These are the two fastest-reacting phases and therefore the two that release heat soonest. Reducing them in favour of belite is exactly how a low heat cement is formulated for use in mass concrete. Heat and early strength cannot readily be separated from one another.

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